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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f8b7e3e7896dafe5b4b8432c771c2acb4afb62fee8268fc40c3f6dcfa5e67f6' 
  AND token = '+GmjNbGAgFH+k2nteHdIpY0VqDbfbEj9/hxbbFqy0qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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