Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0ad5a81b94ba6906c72f2f0f1b3c2fe577de10afdf5c79db56edb90df430482' 
  AND token = '4/UmZEmPVFTkNpE4NaLF+0KzGp3mu5WQ7uKmH3758Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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