SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06a45cfe38ad3bbe80db2e1696f1a3790f3b94ad19a0f3447885b66d892a0932' 
  AND token = 'ZUKNwXJyNVomC5gDjrhc6qT0JxsGjUl9Kx5BXEmI9jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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