SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ca0ef7fc537cdc6029ae035d0b782d69e3eefa58c6a51c8bd8f26323dd72ca1' 
  AND token = 'q9SIY+WAcN5u58Q+tlDbp9mVfDrBKcBv/x/zTIQnGTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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