Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bddfd652883c4a6a9e0daf8efea1b1ef2c2e02a2de4f485efe2de8eea6d9447' 
  AND token = 'l4MMiGYvbuKuwvaZ3aF6gqhhzQ9+CVVaa+BeN3N+/iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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