SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02f9c21fa8f763377f544bf183d5ceb2de38398d3eb72a0e27509cbb00c2847b' 
  AND token = '0dF4wyLh73LW2iVt9GKtgBltZILMUgHhCBsj2lRnnsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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