Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '993990571dfbf4706b3f9fa2c2748dbfbaf0d4668e31f58a1af9022265b9af1f' 
  AND token = 'oiLLVmIogpgGujbi4ZaWJ6FDi7ddM95hxtqOP787SWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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