SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '606057018589c4fb675d7416416683e9ed1609869f67d643dcd106a4bf9fcf46' 
  AND token = 'b4PuexwqZoyW/MVg97LG4Cwh8v2WLuzM30d/OCC0oYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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