SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '133d6151e1b4b54538b2fa20c7f38a987b78ccdf5321539966c208b23a72e2d4' 
  AND token = 'FT6mzpekSM39ylV7++8+1JPrE8Gj25xjsOEtKiDJtgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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