SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4197c0e5576357a1d87ec3cb60d313686290a0f2fa5eed5d8b564b71f2674b51' 
  AND token = '+4VF/ADJG2VtSaM6a5rVIzLrL5nPrplDYUMIMwVqOnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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