SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '881bd3ebe32d66d7979d219634d3e2895cd9a8ac07fb283a8d04c1b8875bb20e' 
  AND token = 'r4F4dGfWB36VuN7LaubiEZqFnc/xvIw+IXFuDpKG2pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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