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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd7317e399eede92127f6ccae830889dedead0f308a434826d34e0802aca52a9' 
  AND token = 'bMZRezehEM/+gqZlg4nBKJrvEMvHGBgzP8cQS6gcRU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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