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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '174650f2b67c26e1b17715a020b6230696676b7796f6f6ad30fe9e328389692d' 
  AND token = 'GQiGEPVsCRnBTz5rxx4PGlg6xScOQn5XHAbk6qdIZ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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