SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ae932268651090c03fd0cec831a799a92de929bda7e8eec37be95b34f2b788b' 
  AND token = 'n+atDy5nN6HCVKxG3pIdsJYYj4FftqpIdhIaFwGNKD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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