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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffdd99864cf5c938019c59e5ef4076a39b68661de90b6303c695c837779f3d6d' 
  AND token = '2H/dvvwCXBAnWRUC3pBbqPeteGcB69O0d0gMprDf9Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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