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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd22fc8c1f1d0f56e657fb4274e0373c85901fc1de35622cfd7a6ec7712d66d42' 
  AND token = 'wHV1Nu4fl2YMwh3yynbn05Du5+spQUYuNsfqKqdEm9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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