SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf5dec3eb53e0313e38638a9f2db8518221d32587dd4b0ead076fd2db64de670' 
  AND token = 'pHxBagCauQwlhkgN/9OiKZol8JYtDdXPF5PwEkRSQAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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