Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c97fa25f72476777940c1aaeb8635ecedf24bc7703c27273d63472df459fc50' 
  AND token = 'QEx3u389/so14/OE6gnmyDlVxpsh5TzkXcy5TlVzxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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