SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0579ec68105f3e39c782eccfd5604c883045c375db8e4b91d3ab5a2093d1d51b' 
  AND token = 'gMTKMA0GrbEE4YBU0hCKrQoB2KChyWPKxmTw/GGHUWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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