SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a59f64b4cd939ae7e072d3cd6ec9aa0418da40d7a734c3b4ca4d110b0928aec' 
  AND token = 'zzsDlGVWbhhc9IQJYzfBLT8rF+ZpyYWoTbingKUTNy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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