How should I handle session keys in my android application?

The client will receive a key and serial number from the server once they've logged in, the serial number will be changed every time the client makes a new request. The key will remain the same until it expires or is destroyed.
These will need to be sent in every https request.

Here's an example of what the key and serial number looks like

```
key: af9bce267343ad72bd6abe7aff58edf2
S/N: 503:960:819

```

Should I use a SQLIte database even though there will be an absolute maximum of 1 session.