SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe18528e23a722d64ab1f80b27bc99f48bb9d064860ea2c3e50a155947c27d8b' 
  AND token = '6Nzjh6fZk+o2vg4pY2nI+luwPVQdMst0J8qDZEsnprw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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