SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1610b2f08d7618c3e16a272d2982275f81a156d9bb4cc85f34934fbd54a4f234' 
  AND token = 'G/F0r/FEviFZPFQKHWa8LqhmVZxov6mv63P5Gh4k0+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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