SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '243088975b5dad24ee740e53f46994af53b96f414d4fcd29d32c946f706d7193' 
  AND token = 'RjqIT7UI5JSZCwoDE1qax/Nn2wKh5GtUAhea2tBYOW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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