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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e4ae21d5f69918a58cedbf4d017025b71edf2ddeb6f4fa5d1f1bf48ddfcae4' 
  AND token = 'pwaykoJxXmqqpI7X0PnzoW5s81d95qCaGWC6KWE9wiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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