How to parse data field?
As @lenni rightly says it's a serialized PHP variable. But data is a property of the user entity type so you don't actually need to unserialize it yourself.

When the user object is loaded from the database it's automatically populated with the unserialized version of the data column. So all you need to do to access your 'user tokens' field (if such a field exists, it doesn't appear to from your screenshot) is this:

global $user;
$user_tokens = $user-&gt;data['user tokens'];