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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '922afd27dd7d9b0a3bfa2a3e88dd3ec08d05618274000d7aa0ba24a43e0f2ee6' 
  AND token = 'BtAjunl0sSgOrmry5aHYmXhspU5ZrsVdCSQ81aMZaLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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