SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '957a3f28b8757dd0d119a6a1744a63e29462af81f94f4d401e2df061178505ea' 
  AND token = 'GW9uZhgzew68fNjR4vJNhdx8dw7CvqzXdAUq2m6TI0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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