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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87ce084567ae4e553df67a4726a89fb038784918b1a69a12217a357c45b30b2e' 
  AND token = 'ttWGB0emNGAN//G6mXvaORB6+25701qXYDeK7CpY/kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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