SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c13a4681b1f429c3e03a16ec674c9527d1e317f27a74f388969b8c2d26f4cd66' 
  AND token = 'FJ3+YmKVGeYG+6v+U/jbZ004LA4anoWW3bejyaVJliE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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