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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04c5bd8df17ab6b8b20f987d06a7933fb93a7b51e57a441725c005691fb776b8' 
  AND token = 'iGFzA8BNgUNlMkWFoRmUNvI8hziSm2o2SghUUxmCBxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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