SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7e7522793969ce8f6471474669c2bf6e882755c542a3135c9b783adb770ed15' 
  AND token = 'jwjxR4dVhruWhH/WBkwzexI5OnMsu3kETtMFzuEGJkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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