difficulty in easily determining whether a released access_token has expired

[gianpaolo-tndigit]

The oauth_access_token contains a serialized version of the AACOauth2AccessToken class, which complicates verification by external tools, such as the database, when attempting to retrieve the token and determine if it has expired.
Including an expiration_date field in the table oauth_access_token would be helpful to make this process easier.