I'm not really clear on what you want. It looks like you just want to verify that a user is not in the Unregistered group or in the Users Awaiting Confirmation group? I have no idea what this 'key' is and how it works though. In the user table, there is a usergroup column that says which usergroup they belong to. Perhaps that is what you are looking for.
I have no idea about the HTTP headers response.
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