SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09f51af98f55e4c4860b4fbd98c704174e637210349b032aefc056e9a50931b7' 
  AND token = 'UPMAmSFXrl8D9/BLzKDggjZoQK2161bP2rI0Y7gt2PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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