Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2d0c0f177cb41f0a0c6a099d0ae2acc23c52b277fb95aeb8311a300b67e0312' 
  AND token = 'iaUe7cm6ICWx0yhEzo69tJafn5ZdvdpkRhLvdoDd/0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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