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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '774ffb000d9a20e314257c21a042d217a1326e085c3d49bf435c4c347f9d2ffe' 
  AND token = 'pja2Wx6qjpelPCaQo7ggJPzA9r7eudjX5SlyMQSQj9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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