SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e0aaec7defce2487459b283201399cd8d0f3e01c5bfab857e9ec617cdc0e4d' 
  AND token = '/COCdnvzurv4qJ5a6U9cGBUq6Kw5QYr4ABnBbk6v+HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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