SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '556e97a5d3caf5917de87b43a764028445beda090090d4eaa32241be1f8d5269' 
  AND token = 'I6W8GDZ8YUo+GJrIjHVOY+KLjUA02KCPRVOhl3z+ABA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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