Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27123d3feb9d5734e3ac2ff8f3bb9225661288df3c675f0f232ecd4aa61be3d4' 
  AND token = 'lUBpmAqr/7AELQzkycqGWrI/GTr13Xi1+pznCIDMotg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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