SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2cd438487ba4d0b2bde9dfc947e65fb8f72c6f12051a634c421383571e7f63d' 
  AND token = 'qvKusbSJCGOvdVwKIQRAvTwnwumdXzh5ydSQtY5xiMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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