SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4b2d0295e30f150e50f87541ab2227457595d13b9579f979e6451bc3b6d5cdb' 
  AND token = 'oJjyU4xJPZwlaIbKTNYI8np5FsSlIDrvWV0LYFXQEUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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