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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4311be6a37ca9c4798a3b0dde3da9b9b13d7c9ace5769de98985cc678ec69fd' 
  AND token = 'xQ5D2rjtNFSi3BKShWq1N1UIOILvxeqg/RUtMMP4Udg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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