SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c0f5beccd25f9029530b6828a69b0d1fbb0cd1e3b43662185e2ee3f987b4a5d' 
  AND token = 'IxiJQi3IWIhl+MsXyDkxjpGKRFQlg4Bz7D2ej+EtJ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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