Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcacded05309c2ca70250ae07c40e9542df3af8406da5de2049381eb9528f126' 
  AND token = 'Zg//uy8XIsjtKu8WfYuFqna2HNP17e1iWaWtNS0ZMBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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