SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0d02f7532143ea0cf22d446dde1248762f71ae48c7e473c224a496f51e49fbb' 
  AND token = 'cNY6gn8PG4dVnnv9YD0UKKhB9c5/fZZ7Hlf/RW5xzK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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