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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ca6a4a4eeedc623e18e5b2453ad99bd0f989ea21e9165004e7d2f73eeda7f34' 
  AND token = 'aOSUOi2cLnKNhC60JtOxquBI7jI+1kqyrxdzlfk7YIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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