title: AccessToken matching query does not exist
body: <p>I am creating a an API for registering user based on oauth token. My app has functionality like registration and login, adding restaurant etc. I created user registration part but i get error while login. I want login based on token. </p>
  
  <p>I have used django-oauth-toolkit for this and DRF. </p>
  
  <p>What i have done is</p>
  
  <p><strong>Login based on token</strong></p>
  
  <pre><code>class UserCreateAPI(CreateAPIView):
      serializer_class = UserCreateSerializer
      queryset = User.objects.all()
      permission_classes = [AllowAny]
  
  class UserLoginAPI(APIView):
      permission_classes = [AllowAny]
      serializer_class = UserLoginSerializer
  
      def post(self, request, *args, **kwargs):
          access_token = AccessToken.objects.get(token=request.POST.get('access_token'), expires__gt=timezone.now()) # error is shown here
          data = request.data
          serializer = UserLoginSerializer(data=data)
          if serializer.is_valid(raise_exception=True):
              new_data = serializer.data
              return Response(new_data, status=status.HTTP_200_OK)
          return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
  </code></pre>
  
  <p><strong>For creating user with a token</strong></p>
  
  <pre><code>class UserCreateSerializer(ModelSerializer):
      class Meta:
          model = User
          extra_kwargs = {"password": {"write_only": True}}
  
      def create(self, validated_data):
          username = validated_data['username']
          first_name = validated_data['first_name']
          last_name = validated_data['last_name']
          email = validated_data['email']
          password = validated_data['password']
          confirm_password = validated_data['password']
          user_obj = User(
                  username = username,
                  first_name = first_name,
                  last_name = last_name,
                  email = email
              )
          user_obj.set_password(password)
          user_obj.save()
          if user_obj:
              expire_seconds = oauth2_settings.user_settings['ACCESS_TOKEN_EXPIRE_SECONDS']
              scopes = oauth2_settings.user_settings['SCOPES']
  
              application = Application.objects.get(name="Foodie")
              expires = datetime.now() + timedelta(seconds=expire_seconds)
              access_token = AccessToken.objects.create(user=user_obj, 
                                                      application=application,
                                                      token = generate_token(),
                                                      expires=expires, 
                                                      scope=scopes)
          return validated_data
  
  
  class UserLoginSerializer(ModelSerializer):
      # token = CharField(allow_blank=True, read_only=True)
      username = CharField()
      class Meta:
          model = User
          fields = [
              'username',
              'password',
              # 'token',
  
          ]
          extra_kwargs = {"password":
                              {"write_only": True}
                              }
  </code></pre>
  
  <p>I have excluded fields part and validation part for shortening the code</p>
  
  <p>Am i doing the right way?</p>