SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '374f117edcf2485b61674fd86693b36b12fe9c97514456e23551d21150449de5' 
  AND token = 'zAl+PXoTF/tS9fK9swI0r5piNLPa4YyCzveRjJd/U+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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