Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca0f40b09d12af188bee0ec555d4b1ccdeca6dffd18ae279a5e0c510dae1097d' 
  AND token = 'iIoTyIV9eKTwp2+lGrsUxLCoI1YQc20HwYU08HeQRQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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