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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b9c27caae23649ab04219acd71628ca63f99ef4738d589b77a612d1c2d19133' 
  AND token = 'TgWJfuDotf45A9Z10No16jc04m9nQqiHMDaoqL/8sCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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