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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71b1d8bec5d226aceb2dc1320c833100718eb6fbf1511f90831348c4e8cc6f2c' 
  AND token = 'FNtk9onZiS+RcyZd2neGk3lYyKM/xfpR4ZbkQUx/Gg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}