simplify the logic, add an extra check on the API auth handler

[nextgens]

What type of PR?

enhancement

What does this PR do?

simplify the logic of API authentication, ensure that the API token is at least 3 characters

Related issue(s)

Prerequisites

Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

• In case of feature or enhancement: documentation updated accordingly
• Unless it's docs or a minor change: add changelog entry file.

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