Increased expiry time of access token

[deepansh96]

Fixes #311

Summary

Test Plan

• Wrote tests
• Tested locally
• Tested on staging
• Tested on production
• If adding or removing any environment variable:
  • update docs/ENV.md
  • update the environment variables for staging and production
• If changes in DB, update DB schema and BigQuery (staging and prod)

[codecov]

Codecov Report

Merging #312 (58cb3c4) into master (c4d217d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #312   +/-   ##
=======================================
  Coverage   97.19%   97.19%           
=======================================
  Files         148      148           
  Lines        2851     2851           
=======================================
  Hits         2771     2771           
  Misses         80       80           

Impacted Files	Coverage Δ
plio/settings.py	87.01% <ø> (ø)

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