SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b30e6fb67078210c73178c9aa9ad080a1f908564fd5bf9fc324121892f850f67' 
  AND token = '1fL3BUxxrTpYHlJb9W4Ki+2XwGdjqZ8M+PtVIZ+mcjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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