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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9ce4308c68799bf0cbb7e2aafbb30a3b2b8978814d95ad9c9f93b8cff23350' 
  AND token = '2yXqH1mm27edal6SsJAv+EkkR7JfORLnd04/xU4yfh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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