SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d94f93c590d2b4ed9f587b9d9ea273297ea872f55d26c3114a72cef493c5a1' 
  AND token = 'MzXM6mG+IkYpcNq8LYoBp6yxEjnB0JfwvYOmAblvhvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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