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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b8d4e0131b0bbf7b768f537acc35f110c43bf1c6e175a30b059dfd80d2a5a57' 
  AND token = 'aa+gU6Coo3g5G7lO1nKCzb4LJPkFJyfsd7mC8WlrWss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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