Fixing cache purge before token expires

[jmprieur]

Purpose

The serialized token cache should not be purged before the access token expires (otherwise the user will have to re-sign-in in a web app). However the SQL sliding expiry is 20 mins by default, whereas the token usually expire after 1h

Does this introduce a breaking change?

[ ] Yes
[ x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ x ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]

• Test the code
  Run the the sample

Other Information

See also #115 (comment)

[jmprieur]

@jennyf19 @bgavrilMS @trwalke @pmaytak @neha-bhargava @kalyankrishna1 @Shama-K
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