If your key is expired, try to log out and then log back in. The webapp checks the license information on login and stores it in the session; if you have stayed logged in since then, it wouldn't have gotten updated on the UI, even if it is active.
There is also a feature in the license section of the website under All Organizations settings. This allows you to click "Update License" in order to refresh the license information stored in the session. If this is done, then you do not have to log out.