SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a78c9f549770bb2488117e94e508320411bf55f33b254a7b0b73f83ee96e7ef' 
  AND token = 'qvBxY3zJ8HaWizTG+nRCKdAhr6QOfryScehKeEhsI7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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