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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40813bf8216bc3539041a9ff07690cf1b29f97df0e0fc0406deb9c7805b30efe' 
  AND token = '8eUTHJl9fFZrQZjNotbI3f6l+y2PTmkhb2fcEJyD1a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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