Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c25382f197a7fce1e60ca7ce828dde51f1301a2bd50c716b5be49a46fb10fd' 
  AND token = 'VfHQpvxmbamUg0hPL9F7ynolCKFM28CyNTisQQnuFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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