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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f224cb8a99805e5552513bf4cd269ce0296e1f7cdfdcd7d142b31537ecceda8' 
  AND token = 'NH9zerJGG3hgrTdPwdevdpUAVRzxixT3U02J0k1VKl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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