SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '236ffcfda962fcb9cfdf8b3777675476c7087964276bd476253233cdb3b3d4e4' 
  AND token = 'aJTV+MnNv/tS5u6RRs5VsGOYXT0W7ubjgZEHOo8Xpmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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