SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b6f96aed1ef7ad751f52eef6224083ef42b997b5b62fa5955e7607d3d426233' 
  AND token = 'uJegw+eA65+0npoiYIyFhlBaCRIgZ+/iuCLwVzXgZdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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