SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd999b669b5f6bc3ce38ce8a478ba432949bb94334471e1ffbb7f0c768e3300ff' 
  AND token = 'J2pW3x7OGPjDWBm1jFZ8VwfA4uSvc79hOMLodIA+nmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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