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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '407d7f8322f19b6b8f7f608f63720de4429a7c9205e095c53dfdbe853bf9f04f' 
  AND token = 'fG6fKnGpL8W9w6VVa0T5b5nuXb62b7WEVjhYhDQCk1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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