Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6ad00b9cf0e79d5d799198bb3bf23c9d2a43995cad5071485b27b2f29e6b174' 
  AND token = '2JJqtGGGYi9bPJ5UNmL4Fn758CPA1Yc2xLKf/8dng7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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