SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d059c70887b5d36edf7b01c7c75355bbd1c23f7fb28f4522798bf121d658f8a' 
  AND token = 'o1xKvid7cHvMbhvhvbYBXVBhgvCikV0pTc+ew9LBODA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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