Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b4913b17498a0e10f6cdf30139bca4d3c609543d8074e02fbb2fbe441a57c87' 
  AND token = '9Mjh+AbY6urFac0GIL4mL56T2QDH6waNYta8cXNossM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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