SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1916322eff0ba32fde3e8cccbf90638d274ba81288564f7b09e44a3a6931879' 
  AND token = 'HN3duH6WVVsO29TOGgMhDHpABQFZa5qQtOjAxwf+g1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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