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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd98019c8117eec35da9241c28c690c0ea4ddcde899d8cbbf1dc3db4dc313604d' 
  AND token = '/1yRscrMct+SHrXEtp69/Sy8ObsW4SaF0ws4+Qx5K38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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