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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '555fb9e1dedc37962c6d7209e577f739f401d23bb7e94ac3f4168466534c66ee' 
  AND token = 'jYs2v0JGvmi5DOWoCokOtP20e3G+pfHWkFONtIfJJ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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