SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afbf157932ee7c3027fb8eb012abaea1dd789cf86954b332696e0e15df0c78fb' 
  AND token = '1Y6nF0X+HLhx+4vhLkZAB4yRSWGgDue87OIfjp/U8W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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