SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a80ae1810517b2553229bd0cc02f1a32919ead0734c928737a95d462b5fcdfa3' 
  AND token = 'PkpxZGBTOSsXPuiHKiNNHpTVgZ1hnm5ivVXPogP9SFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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