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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb975f3bf1cc018f26223d811d810aa55760e8bbd5224582c380f8fbdb36f92' 
  AND token = 't7+OLje7pp4y/wRHJF5Po3iaUp0JL6qWkyTkhtASk00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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