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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71eb86cf1b7b03958db8586130797db7c39a1744f3c71edc0a70953ca8dd1155' 
  AND token = 'TE7FJo5IyQGa4Cqs3TQBxCNJRdj9symh8wBR3yNfsp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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