SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '329019d2270bf47e0edc2fab2de34fef05618719e5750533e02e13a3cce4c557' 
  AND token = 'vRX6B/81IhUmP88DwH9ZMxsnvJf+/cFzkYaI5y2h0YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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